The invention relates to the technical field of medicine, and provides a moxifloxacin hydrochloride pharmaceutical composition, a preparation method and application thereof. The moxifloxacin hydrochloride pharmaceutical composition comprises, in parts by weight, 40-50 parts of moxifloxacin hydrochloride, 4-5 parts of pregelatinized starch, 10-15 parts of microcrystalline cellulose, cross-linked carboxymethyl 3-4 parts of cellulose sodium and 0.3-1 part of magnesium stearate; the preparation method comprises mixing moxifloxacin hydrochloride, pregelatinized starch, microcrystalline cellulose and cross-linked carboxymethyl cellulose sodium, adding water Granulate, then add magnesium stearate, mix well and make capsules or tablets. In this example, by limiting the content of the components, the drug can be released slowly in the body, reducing the direct stimulation of moxifloxacin hydrochloride to the gastrointestinal tract, thereby reducing its side effects, especially the occurrence of severe gastrointestinal reactions, and improving the quality of the patients. The compliance and safety of medication make it easier for patients to tolerate and benefit long-term treatment.